linux-kernel - Re: Linux messages full of `random: get_random

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Message-ID: <20180429170541.lrzwyihrd6d75rql@sultan-box>
Date:   Sun, 29 Apr 2018 10:05:41 -0700
From:   Sultan Alsawaf <sultanxda@...il.com>
To:     Pavel Machek <pavel@....cz>
Cc:     "Theodore Y. Ts'o" <tytso@....edu>, linux-kernel@...r.kernel.org,
        Jann Horn <jannh@...gle.com>
Subject: Re: Linux messages full of `random: get_random_u32 called from`

On Sun, Apr 29, 2018 at 04:32:05PM +0200, Pavel Machek wrote:
> Hi!
> 
> > This is why ultimately, we do need to attack this problem from both
> > ends, which means teaching userspace programs to only request
> > cryptographic-grade randomness when it is really needed --- and most
> > of the time, if the user has not logged in yet, you probably don't
> > need cryptographic-grade randomness....
> 
> IOW moving them from /dev/random to /dev/urandom?
> 								Pavel
> 
> -- 
> (english) http://www.livejournal.com/~pavelmachek
> (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

/dev/urandom isn't cryptographically secure, so that's not an option.